content/browser/browsing_instance.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/browsing_instance.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "content/browser/site_instance_impl.h"
  10 #include "content/public/browser/browser_context.h"
  11 #include "content/public/browser/content_browser_client.h"
  12 #include "content/public/common/content_switches.h"
  13 #include "content/public/common/url_constants.h"
  14
  15 namespace content {
  16
  17 BrowsingInstance::BrowsingInstance(BrowserContext* browser_context)
  18     : browser_context_(browser_context) {
  19 }
  20
  21 bool BrowsingInstance::HasSiteInstance(const GURL& url) {
  22   std::string site =
  23       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
  24           .possibly_invalid_spec();
  25
  26   return site_instance_map_.find(site) != site_instance_map_.end();
  27 }
  28
  29 SiteInstance* BrowsingInstance::GetSiteInstanceForURL(const GURL& url) {
  30   std::string site =
  31       SiteInstanceImpl::GetSiteForURL(browser_context_, url)
  32           .possibly_invalid_spec();
  33
  34   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  35   if (i != site_instance_map_.end())
  36     return i->second;
  37
  38
  39   // No current SiteInstance for this site, so let's create one.
  40   SiteInstanceImpl* instance = new SiteInstanceImpl(this);
  41
  42   // Set the site of this new SiteInstance, which will register it with us.
  43   instance->SetSite(url);
  44   return instance;
  45 }
  46
  47 void BrowsingInstance::RegisterSiteInstance(SiteInstance* site_instance) {
  48   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->
  49          browsing_instance_ == this);
  50   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
  51   std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
  52
  53   // Only register if we don't have a SiteInstance for this site already.
  54   // It's possible to have two SiteInstances point to the same site if two
  55   // tabs are navigated there at the same time.  (We don't call SetSite or
  56   // register them until DidNavigate.)  If there is a previously existing
  57   // SiteInstance for this site, we just won't register the new one.
  58   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  59   if (i == site_instance_map_.end()) {
  60     // Not previously registered, so register it.
  61     site_instance_map_[site] = site_instance;
  62   }
  63 }
  64
  65 void BrowsingInstance::UnregisterSiteInstance(SiteInstance* site_instance) {
  66   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->
  67          browsing_instance_ == this);
  68   DCHECK(static_cast<SiteInstanceImpl*>(site_instance)->HasSite());
  69   std::string site = site_instance->GetSiteURL().possibly_invalid_spec();
  70
  71   // Only unregister the SiteInstance if it is the same one that is registered
  72   // for the site.  (It might have been an unregistered SiteInstance.  See the
  73   // comments in RegisterSiteInstance.)
  74   SiteInstanceMap::iterator i = site_instance_map_.find(site);
  75   if (i != site_instance_map_.end() && i->second == site_instance) {
  76     // Matches, so erase it.
  77     site_instance_map_.erase(i);
  78   }
  79 }
  80
  81 BrowsingInstance::~BrowsingInstance() {
  82   // We should only be deleted when all of the SiteInstances that refer to
  83   // us are gone.
  84   DCHECK(site_instance_map_.empty());
  85 }
  86
  87 }  // namespace content